EPA Method 507 Nitrogen Phosphorus Pesticide Back Catalog number: 31882 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended L19000001ME Phenol-Mix 1, 50µg/ml in MeOH, 10ml Price on request 79238 Propanil Price on request 10709.4-100-ME O,O-Diethylthiophosphate-13C2, sodium salt, 100µg/ml in MeOH, 1ml Price on request